How to make part change BrickColor on contact?

So the problem with using BrickColors is that the random function only chooses a random color from all the colors. So what I put those colors into a table and had a random function choose the index instead, then it would assign the color chosen to the part. I also added a debounce for your touched event for you.

local colorPart = script.Parent
local debounce = true
local colors = {Color3.fromRGB(0, 97, 255), Color3.fromRGB(165, 0, 255), Color3.fromRGB(0, 225, 255)}

--these functions will allow you to add/remove/edit colors easily if you plan on making this script into something bigger

local function editColors(index, color)--color would be a vector3
    colors[index] = Color3.fromRGB(color)
end

local function addColor(color)--also a vector3
    colors[#colors+1] = Color3.fromRGB(color)
end

local function removeColor(index)
    table.remove(colors,index)
end

colorPart.Touched:Connect(function()
    if debounce then
        debounce = false
        local x = math.random(1,3)
        colorPart.Color = colors[x]
    end
    wait(1)
    debounce = true
end)

I have tested this, it does work, and if it solves your problem, then please mark it as the accepted answer.

Also, I just picked random rgb values that came close to the colors you specified, if they aren't exactly what you want you can tweak them, and I recommend using this tool to help you pick the colors.

local colorPart = script.Parent
local random = 0
local colorTable = {"Really blue", "Royal purple", "Bright blue"}
math.randomseed(tick())

local function changeColor(part)
    random = math.random(1,3)
    print(random)
    colorPart.BrickColor = BrickColor.new(colorTable[random])
    wait(0.2)
end

colorPart.Touched:Connect(changeColor)

this should do exactly what you want and will randomly give you one of the three colors.

I do suggest adding in a debounce though so that it doesn't flash a bunch of colors